THE PARTICULATE MATTER & PRECIPITATION
Analysis of Particulate Matter and Precipitation in February, March, April, and May 2019
PM, precipitation, humidity, wind speed, wind direction, and vapor pressure were analyzed on an hourly basis for each date in March, April, and May (it is limited to Seoul). The following indicated only days of precipitation:
1. February
February had precipitation on 3, 15, and 19. Data were inserted on the 4th, 16th, and 20th to analyze
PM the next day due to precipitation.
1)
2/3 (There was a precipitation)
Average daily concentration of particulate matter: 25.70833333
2/4 (The next day)
Average daily concentration of particulate matter: 35.375
It can be observed that it rained on February 3 and the concentration decreased at dawn on February 4. But it appears to be increasing. In fact, the average daily concentration of particulate matter rose from 25.70833333 (2/3) to 35.375 (2/4).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. However, it lasted more than three hours and had accumulated rainfall of more than 4mm. It is estimated that other causes were more responsible than precipitation.
2)
2/15 (There was a precipitation)
Average daily concentration of particulate matter: 26.3333333
2/16 (The next day)
Average daily concentration of particulate matter: 32.08333333
It can be observed that it rained on February 15 and the concentration decreased at dawn on February 16. But it appears to be increasing. In fact, the average daily concentration of particulate matter rose from 26.3333333 (2/15) to 32.08333333 (2/16).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. It lasted more than three hours, but the cumulative rainfall is small. Therefore, the effect of precipitation on particulate matter would be small. And, it is estimated that other causes were more responsible than precipitation.
3)
2/19 (There was a precipitation)
Average daily concentration of particulate matter: 11.45454545
2/20 (The next day)
Average daily concentration of particulate matter: 25.41666667
The average daily concentration of particulate matter rose from 11.45454545 (2/19) to 25.41666667 (2/20). It can be seen that other factors besides precipitation affected PM.
On February 20, the concentration of particulate matter (PM10) in Korea increased due to atmospheric congestion, accumulating fine dust generated in Korea and adding inflow from abroad from daytime.
2. March
March had precipitation on 15, 20, and 30. Data were inserted on the 16th, 21th, and 31th to analyze PM the next day due to precipitation.
1)
3/15(There was a precipitation)
Average daily concentration of particulate matter: 27.375
2/20 (The next day)
Average daily concentration of particulate matter: 18.91666667
It can be observed that it rained on March 15 and the concentration decreased on March 16. The average daily concentration of particulate matter decreased from 27.375 (3/15) to 18.91666667 (3/16). It can be seen that the previous day's precipitation reduces PM the next day.
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. It lasted less than three hours, and the accumulated rainfall is small. But, it is thought that the involvement of the other factors affected was small and precipitation was dominant.
2)
3/20(There was a precipitation)
Average daily concentration of particulate matter: 49
3/21(The next day)
Average daily concentration of particulate matter: 17.91304348
It can be observed that it rained on March 20 and the concentration decreased on March 21. The average daily concentration of particulate matter decreased from 49 (3/20) to 17.91304348 (3/21).
There was a heavy rain of more than 7.5 mm/h and 60% PM reduction efficiency. It is thought that the involvement of the other factors affected was small and precipitation was dominant.
3)
3/30(There was a precipitation)
Average daily concentration of particulate matter: 16.75
3/31(The next day)
Average daily concentration of particulate matter: 28.66666667
It can be observed that it rained on March 30 and the concentration decreased at dawn on March 31. But it appears to be increasing. In fact, the average daily concentration of particulate matter rose from 16.75 (3/30) to 28.66666667 (3/31).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. It lasted less than three hours, but the accumulated rainfall is small. Therefore, the effect of precipitation on particulate matter would be small.
3. April
April had precipitation on 6, 9, 14, 20 and 24, 25. Data were inserted on the 7th, 10th, 15th, 21th and 26th to analyze PM the next day due to precipitation.
1)
4/6(There was a precipitation)
Average daily concentration of particulate matter: 47.41666667
4/7(The next day)
Average daily concentration of particulate matter: 46.70833333
It can be observed that it rained on April 6 and the concentration decreased on April 7. The average daily concentration of particulate matter decreased from 47.41666667 (4/6) to 46.70833333 (4/7).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. It lasted less than three hours, and the accumulated rainfall is small. But, it is thought that the involvement of the other factors affected was small and precipitation was dominant.
2)
4/9(There was a precipitation)
Average daily concentration of particulate matter: 18.82608696
4/10(The next day)
Average daily concentration of particulate matter: 6.25
It can be observed that it rained on April 9 and the concentration decreased on April 10.
However, it is difficult to know the concentration of particulate matter by time on April 10.
So it's hard to explain the possibility of other factors that have affected.
3)
4/14(There was a precipitation)
Average daily concentration of particulate matter: 24.56521739
4/15(The next day)
Average daily concentration of particulate matter: 29.78947368
It can be observed that it rained on April 14 and the concentration decreased at dawn on April 15. But it appears to be increasing. In fact, the average daily concentration of particulate matter
rose from 24.56521739 (4/14) to 29.78947368 (4/15).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. It lasted less than three hours, but the accumulated rainfall is small. Therefore, the effect of precipitation on particulate matter would be small.
4)
4/20(There was a precipitation)
Average daily concentration of particulate matter: 31.95833333
4/21(The next day)
Average daily concentration of particulate matter: 30.75
It can be observed that it rained on April 20 and the concentration decreased on April 21. The average daily concentration of particulate matter decreased from 31.95833333
(4/20) to 30.75 (4/21).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. It lasted less than three hours, and the accumulated rainfall is small. But, it is thought that the involvement of the other factors affected was small and precipitation was dominant.
5)
4/24(There was a precipitation)
Average daily concentration of particulate matter: 32.86363636
4/25(There was a precipitation)
Average daily concentration of particulate matter: 70.75
4/26(The next day)
Average daily concentration of particulate matter: 13.66666667
It can be observed that it rained on April 24 and the concentration decreased at dawn on April 25. But it appears to be increasing. In fact, the average daily concentration of particulate matter
rose from 32.86363636 (4/24) to 70.75 (4/25).
This is due to morning air congestion and afternoon inflow from abroad.
It can be observed that it rained on April 25 and the concentration decreased on April 26. The average daily concentration of particulate matter decreased from 70.75 (4/25) to 13.66666667 (4/26).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. But, it lasted more than three hours, and the accumulated rainfall is over 4mm. So, it is thought that the involvement of the other factors affected was small and precipitation was dominant.
4. May
May had precipitation on 19 and 27. Data were inserted on the 20th, and 28th to analyze PM the next day due to precipitation.
1)
5/19(There was a precipitation)
Average daily concentration of particulate matter: 19
5/20(The next day)
Average daily concentration of particulate matter: 30.47826087
It can be observed that it rained on May 19,20 and the concentration decreased at dawn and morning on May 20. But it appears to be increasing.
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. However, it lasted more than three hours and had accumulated rainfall of more than 4mm. It is estimated that other causes were more responsible than precipitation.
2)
5/27(There was a precipitation)
Average daily concentration of particulate matter: 28.16666667
5/28(The next day)
Average daily concentration of particulate matter: 21.5
It can be observed that it rained on May 27 and the concentration decreased on May 28. The average daily concentration of particulate matter decreased from 28.16666667 (5/27) to 21.5 (5/28).
Rainfall intensity of 5 mm/h or less, with a PM10 reduction efficiency of 40% or less. But, it lasted more than three hours, and the accumulated rainfall is over 4mm. So, it is thought that the involvement of the other factors affected was small and precipitation was dominant.